Warmblood Mare Residing in Kentucky Tests Positive for EHV-1

A recently imported Warmblood mare now residing in Kentucky has tested positive for the neurologic strain of EHV-1.
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The Equine Disease Communication Center (EDCC) reported Feb. 28 that a recently imported Warmblood mare now residing in Kentucky has tested positive for equine herpesvirus-1 (EHV-1).

“On Monday Feb. 26, the Kentucky Office of the State Veterinarian received notification confirming the diagnosis of equine herpes myeloencephalopathy (EHM, the neurologic form of the virus) in a Warmblood mare that had imported through the USDA’s New York Animal Import Center and consigned to a private quarantine facility in Kentucky to complete CEM (contagious equine metritis) quarantine,” the EDCC said. “The mare arrived at the Kentucky facility on Feb. 18 and first developed acute neurologic signs during the evening on Sunday, Feb. 25. The mare was referred and transported to a local equine hospital the following morning where she was diagnosed positive for EHV-1 neuropathogenic strain.

“This mare had no direct exposure to resident horses while in quarantine and no other horses in the facility are exhibiting clinical signs of EHM,” the agency continued. “The population of horses will continue to be monitored and horses identified or considered to have had indirect exposure will test negative prior to being released from quarantine. Transport cohorts have been identified and notices given to appropriate personnel. USDA officials and transport staff have been notified of the diagnosis.”

Herpesvirus is highly contagious among horses and can cause a variety of ailments in equids, including rhinopneumonitis (a respiratory disease usually found in young horses), abortion in broodmares, and EHM. In many horses, the only sign of EHV-1 infection is fever, which can go undetected

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Written by:

Erica Larson, former news editor for The Horse, holds a degree in journalism with an external specialty in equine science from Michigan State University in East Lansing. A Massachusetts native, she grew up in the saddle and has dabbled in a variety of disciplines including foxhunting, saddle seat, and mounted games. Currently, Erica competes in eventing with her OTTB, Dorado.

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